vgmstream/src/meta/scd_pcm.c

#include "meta.h"
#include "../util.h"

/* PCM (from Lunar: Eternal Blue (Sega CD) */
VGMSTREAM * init_vgmstream_scd_pcm(STREAMFILE *streamFile) {

    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];
    off_t start_offset;

    int loop_flag;
    int channel_count;

    /* check extension, case insensitive */
    streamFile->get_name(streamFile,filename,sizeof(filename));
    if (strcasecmp("pcm",filename_extension(filename))) goto fail;

    /* check header */
    if (read_32bitBE(0x0,streamFile) != 0x00020000)
        goto fail;

    loop_flag = (read_32bitLE(0x02,streamFile)!=0);
    channel_count = 1;

    /* build the VGMSTREAM */
    vgmstream = allocate_vgmstream(channel_count,loop_flag);
    if (!vgmstream) goto fail;

    /* fill in the vital statistics */
    start_offset = 0x200;
    vgmstream->channels = channel_count;
    vgmstream->sample_rate = 32000;
    vgmstream->coding_type = coding_PCM8_SB_int;
    vgmstream->num_samples = read_32bitBE(0x06,streamFile)*2;
    if(loop_flag) {
        vgmstream->loop_start_sample = read_32bitBE(0x02,streamFile)*0x400*2;
        vgmstream->loop_end_sample = read_32bitBE(0x06,streamFile)*2;
    }
    vgmstream->layout_type = layout_interleave;
    vgmstream->interleave_block_size = 0x1;
    vgmstream->meta_type = meta_SCD_PCM;

    /* open the file for reading */
    {
        int i;
        STREAMFILE * file;
        file = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
        if (!file) goto fail;
        for (i=0;i<channel_count;i++) {
            vgmstream->ch[i].streamfile = file;
            vgmstream->ch[i].channel_start_offset=
                vgmstream->ch[i].offset=start_offset+
                vgmstream->interleave_block_size*i;
        }
    }

    return vgmstream;

  /* clean up anything we may have opened */
fail:
  if (vgmstream) close_vgmstream(vgmstream);
  return NULL;
}